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San Luis (William R. Gianelli) Powerplant *

Needs a description
Related Projects & Facilities
San Luis Unit Project
Related Documents
San Luis Pump-Generating Plant Performance (pdf)

* Plant owned by Reclamation, but operated by a separate entity. Generation is marketed by the Western Area Power Administration, a Federal Power Marketing Administration.


RegionFacilities in Mid-Pacific | Mid-Pacific Home Page
RiverSan Luis Creek
PurposeThe San Luis Pump-Generating Plant pumps Central Valley Project water for offstream storage.
FactsThis joint Federal-State facility, located at San Luis Dam, lifts water by pump turbines from the O`Neill forebay into the San Luis Reservoir. During the irrigation season, water is released from San Luis Reservoir back through the pump-turbines to the forebay and energy is reclaimed. Each of the eight pumping-generating units has a capacity of 63,000 horsepower as a motor and 53,000 kilowatts as a generator. As a pumping station to fill San Luis Reservoir, each unit lifts 1,375 cubic feet per second at 290 feet total head. As a generating plant, each unit passes 1,640 cubic feet per second at the same head.
HistoryThe powerplant is operated and maintained by the State of California under an operation and maintenance agreement with Reclamation. The pumping-generating plant name has been changed by the State of California to William R. Gianelli.
Present ActivitiesNormal operations. The pump-generating plant pumps water from O`Neill to San Luis Reservoir. Offsets Central Valley Project pumping loads with generation during releases to O`Neill Forebay.
Special IssuesSpeed changes on two units have resulted in increased efficiency above 300 foot head. California State has requested that one to two more units be reconfigured for operation at higher speeds.
Special IssuesReclamation`s share of the ``Installed Capacity`` below is 202,000 kW.
Special IssuesReclamation`s share of the ``Original Nameplate Capacity`` below is 202,000 kW.
Special IssuesNet Generation`` below represents Reclamation`s share: 116,744,000 kWh in 2005.
NERC RegionWestern Electricity Coordinating Council, California-Southern Nevada Power Area
PMA Service AreaWestern Area Power Administration, Sierra Nevada Region
Plant TypeConventional
Powerhouse TypeAbove Ground
Turbine TypeFrancis
Original Nameplate Capacity424,000 kW
Installed Capacity424,000 kW
Year of Initial Operation1968
Age39 years
Net Generation126,409,000 kWh
(Fiscal Year)2007
Rated Head323 ft
Plant Factor7.1 percent
(Fiscal Year)2007
Production ModeSeasonal Base
Remotely OperatedNo
Project AuthorizationFunds for construction of the initial features of the Central Valley Project were provided by the Emergency Relief Appropriation Act of 1935 (49 Stat. 115). The Secretary of the Interior authorized the project and the President approved it on December 2, 1935.
Project AuthorizationThe San Luis Unit, West San Joaquin Division, was authorized as a part of the Central Valley Project on June 3, 1960, Public Law 86-488.
Project PurposeThe Central Valley Project, one of the Nation`s major water conservation developments, extends from the Cascade Range on the north to the semiarid but fertile plains along the Kern River on the south. Initial features of the project were built primarily to protect the Central Valley from crippling water shortages and menacing floods. New project units were built to provide water and power to match the continued growth of the State.
Project PurposeAlthough developed primarily for irrigation, this multiple-purpose project also provides flood control, improves Sacramento River navigation, supplies domestic and industrial water, generates electric power, conserves fish and wildlife, creates opportunities for recreation, and enhances water quality.
OrganizationState of California
Phone (Office)209 826-1277

Last updated: Dec 16, 2013